IPhone 4s iMessage stopped working?

Well, I was texting my friend. He owns an iPhone as well. Well, anyways we were texting when out of nowhere my messages send as regular texts instead of iMessages. I can still use iMessage with my mom so I don't know what's going on. This Is extremly frustrating.

I have faced the same snag. Just check if your phone os is updated and if this happens again, switch the 3G network settings on and off. Try again, it should work.

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